42. Solution to Chemistry Problem
Seller: Derkach
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- At temperature T, the vapor pressure of a solution of concentration c, % of an unknown non-volatile substance in a liquid solvent is equal to P Pa; the density of this solution is d. The dependence of the saturated vapor pressure on the temperature above the liquid and solid pure solvent is given in Table 1 (Appendix):
- calculate the molecular mass of the dissolved substance;
- determine the molar and molal concentrations of the solution;
- calculate the osmotic pressure of the solution;
- plot the P - f (T) curve for the given solution and solvent;
- determine graphically the temperature at which the vapor pressure above the pure solvent will be equal to P Pa;
- determine graphically the increase in boiling point at pressure P of a solution of a given concentration c;
- calculate the ebullioscopic constant in all possible ways and compare these values with each other at normal boiling temperature (T n.t.c.)
- determine the freezing point depression
- calculate the cryoscopic constant
Option No. Mass content of non-volatile substance. % Molecular mass of solvent P, Pa T. K d •10-3 kg/m3
7 8 44 65000 223 1,500
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